Up-regulation of serine/threonine protein phosphatase type 2A regulatory subunits during methylprednisolone-induced differentiation of leukaemic HL-60 cells

• Published in: Clinical and laboratory haematology Vol. 22; no. 5; pp. 271 - 274
• Main Authors: Aydin, H.H., Selvi, N., Saydam, G., Tobu, M., Uzunoglu, S., Uslu, R., Buyukkececi, F., Omay, S.B.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Ltd 01.10.2000; Blackwell Science
• Subjects: Anti-Inflammatory Agents - pharmacology; Antineoplastic agents; Biological and medical sciences; Blotting, Western; Cell Differentiation - drug effects; Chemotherapy; Cytosol - drug effects; Cytosol - enzymology; differentiation; HL-60 Cells; Humans; leukaemia; Medical sciences; methylprednisolone; Methylprednisolone - pharmacology; Pharmacology. Drug treatments; Phosphoprotein Phosphatases - drug effects; Phosphoprotein Phosphatases - metabolism; PP2A; Protein Phosphatase 2; Protein Subunits; Time Factors; Up-Regulation; Human; Corticosteroid; Enzyme; Phosphoprotein phosphatase; Leukemia; Phosphoric monoester hydrolases; Esterases; Malignant hemopathy; Cell differentiation; Methylprednisolone; Biological activity; Enzymatic activity; Established cell line; Hydrolases
• ISSN: 0141-9854; 1365-2257
• DOI: 10.1046/j.1365-2257.2000.00326.x

Summary Serine/threonine protein phosphatase 2A (PP2A) may play a role in leukaemic cell differentiation of the HL 60 myeloid leukaemic cell‐line after methylprednisolone induction. We have investigated the specific enzyme activity and expression of catalytic and regulatory subunits of PP2A. The resulting specific enzyme activity and immunoblots showed an increase in enzyme activity and the expression of regulatory subunits after methylprednisolone treatment. There was no change in the expression of PP2A catalytic subunits. It is suggested that the effect of methylprednisolone on leukaemic differentiation may be the result of PP2A upregulation.